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Are older rocks on the ocean floor found near deep sea trenches?
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∙ 12y ago
Yes
Wiki User
∙ 12y ago
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How an isochron map of the ocean floor supports the theory of seafoor spreading?
An isochron is a line on a map that connects points that have the same age. An isochron map of the ocean floor supports the theory of seafloor spreading because it shows the older rock near the deep sea trenches and the younger rocks near ocean ridges.
Why are the oldest part of the ocean floor no older then about 200 million years old?
The ocean is 4 billion yars old, however due to subduction, the oldest sediment found in the ocean's floor is 180 million years old.
Explain how an isochron map of the ocean floor supports the theory of seafloor spreading?
An isochron is a line on a map that connects points that have the same age. An isochron map of the ocean floor supports the theory of seafloor spreading because it shows the older rock near the deep sea trenches and the younger rocks near ocean ridges.
How does the ocean floor near the center slit differ from the ocean floor near the side slit?
The ocean floor near the side slit is colder, denser, and older than the ocean floor near the center slit
How would the age of the oldest rocks on the continents compare with the age of the oldest rocks on the seafloor if the rock on the continents is continually formed but not removed?
The oldest rocks on the continents would be much older than the rocks on the sea floor because the rocks on the continents are not being removed unlike the rocks on the sea floor that are made by the mid-ocean ridge are being removed by deep ocean trenches. this prossess that is occuring on the sea floor is called sea floor spreading. evidence of this is the Pacific ocean shrinking and the Atlantic ocean growing.
What affects the age of the ocean floor?
The distance and rate at which they are growing from "mid-ocean ridges" from which molten rock (magma) rises from the Earth's mantle. Younger rock is closest to these ridges while older rock is further. The old rock will eventually be recycled into the mantle via a process known as "subduction", marked by trenches in the ocean floor. - source: Essentials of Geology 3rd Edition (Marshak, 42)
How do scientists explain older and younger rock placement on the ocean floor?
They measure how far away the rock is from the mid-ocean ridge. The farther, the older.
Why is it that ancient rocks are found on the continents and not on the ocean floor?
The entire ocean floor is recycled in roughly 160 million year cycles through the process of plate tectonics. Because continental plates do not subduct, the rock is much, much older, particularly in the continental interior.
Is there a formal name for the process of the sea floor being older the greater the distance from the mid-ocean ridge?
Sea floor spreading
Why are the oldest parts of the ocean floor no older than about 200 million years.?
Because the oldest parts reach the continental crust and then the ocean floor sinks beneath the continental crust, into the mantle.
What evidence can prove that the ocean floor was moving?
Oceanic crust that was farther away from a mid-ocean ridge was older that crust closer to the ridge
What evidence did harry hess use to prove sea-floor spreading?
Harry Hess was mapping the floor of the ocean when he found a mountain range in the middle of the ocean. He found that the land nearest to the ridge was younger compared to the fact that the farther away land was from the ridge, the older it dated. He used this to find that the mountain ridge was creating new land and pushing aside the old land.
